Add Fence implementation tests back to project. Somehow they had been neglected. Change-Id: Ibe8b063758be8e99978fdd2723192be7bcea6d04 Reviewed-on: https://chromium-review.googlesource.com/232220 Tested-by: Jamie Madill <jmadill@chromium.org> Reviewed-by: Geoff Lang <geofflang@chromium.org>